Bicycle frame



FIG. 1 is a left side elevation view of a bicycle frame showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top, front, and left side perspective view thereof; and,

FIG. 8 is a front elevation view thereof, as part of an exemplary bicycle.

The broken lines in the drawings illustrate portions of the bicycle frame and an environmental bicycle that do not form part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 